Error in story.js 'addEventListener'

Hi

I have a course made with Articulate Storyline 3, and I use JavaScript to save the score in the LMS.

Work fine in IE9, IE11, Chrome, Firefox,... But in IE8 give me the next issue, 

story.js (169,2)

SCRIPT438: El objeto no acepta la propiedad o el método 'addEventListener'

Someone know how can I solve this?

Thanks